This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A201150 #7 Jul 22 2025 16:07:39 %S A201150 11,56,235,860,2910,9287,28452,84473,244933,697065,1954865,5417604, %T A201150 14870436,40495840,109564073,294830410,789790546,2107673769, %U A201150 5606720691,14874608710,39372687032,104018286133,274358183769,722650263970 %N A201150 Number of nX3 0..2 arrays with every diagonal, row and column running average nondecreasing rightwards and downwards and diagonally. %C A201150 Column 3 of A201155 %H A201150 R. H. Hardin, <a href="/A201150/b201150.txt">Table of n, a(n) for n = 1..111</a> %e A201150 Some solutions for n=8 %e A201150 ..0..1..1....0..0..2....0..0..0....0..0..0....0..0..1....0..0..0....0..0..2 %e A201150 ..0..1..1....0..2..2....0..0..1....0..0..0....0..0..1....0..1..2....0..2..2 %e A201150 ..0..1..1....1..1..2....0..0..1....0..0..0....0..0..1....1..2..2....0..1..2 %e A201150 ..0..1..2....1..1..2....0..0..1....0..0..0....0..0..1....2..2..2....0..1..2 %e A201150 ..0..1..2....1..2..2....1..1..2....0..1..1....0..2..1....1..2..2....0..1..2 %e A201150 ..0..1..2....2..2..2....1..2..2....0..1..2....1..2..2....1..2..2....0..1..2 %e A201150 ..2..2..2....1..2..2....2..2..2....0..2..2....1..1..2....1..2..2....1..1..2 %e A201150 ..1..2..2....2..2..2....1..2..2....1..1..2....1..2..2....2..2..2....1..1..2 %K A201150 nonn %O A201150 1,1 %A A201150 _R. H. Hardin_ Nov 27 2011